Exonuclease proofreading by human mitochondrial DNA polymerase.

  title={Exonuclease proofreading by human mitochondrial DNA polymerase.},
  author={Allison A. Johnson and K A Johnson},
  journal={The Journal of biological chemistry},
  volume={276 41},
We have examined the ability of the human mitochondrial DNA polymerase to correct errors in DNA sequence using single turnover kinetic methods. The rate of excision of single-stranded DNA ranged from 0.07 to 0.17 x s(-1), depending on the identity of the 3'-base. Excision of the 3'-terminal base from correctly base paired DNA occurred at a rate of 0.05 x s(-1), indicating that the cost of proofreading is minimal, as defined by the ratio of the k(exo) for correctly base-paired DNA divided by the… CONTINUE READING

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